Method of spinning yarns in spinning turbines

ABSTRACT

In the formation of yarn, in an open-end spinning turbine, from a stream of fibers fed into the turbine together with entrained air, the formation operation is improved by extracting such air from the turbine in a direction toward the region of introduction of the fibers.

O United States Patent 91 [111 3,882,666

Miiller May 13, 1975 [54] METHOD OF SPINNING YARNS IN 3,411,283 11/1968 Isomura 57/58.89 l NI TURBINES 3,584,452 6/1971 Schiltraecht 6t 81.... 57/58.89 3,732,681 5/1973 Kutscher et a1 57/5895 [75] Inventor: P t r Mu r, Lesum. Germany 3,757,506 9/1973 Kutscher et a1 57/5895 Assigneez Fried pp Gesellschaft mit 3,774,386 11/1973 Kutscher et a1 57/5895 beschr'finkter Haftung, Essen, Germany Primary Examiner-John Petrakes 22 i 6 1973 Attorney, Agent, or FirmSpencer & Kaye [21] Appl. No.: 422,144

[30] Foreign Application Priority Data [57] ABSTRACT Dec. 28, 1972 Germany 2263730 In the formation of yarn, in an open end Spinning mp bine, from a stream of fibers fed into the turbine to- [52] C1. 57/156; g with entrained air the formation operation is [51] hit. C1 D0111 improved y extracting Such air from the turbine in a Fleld of Search 156 direction toward the region of introduction of the bers. [56] References Cited UNITED STATES PATENTS 6 Claims, 1 Drawing Figure 3,328,949 7/1967 Pavek et a1. 57/5889 1 sucrm/v BLOWER ASSEMBLY PATENTEDHHI $975 3,882,666

l 4 'l h 2 JO '9 1 Q14 11 g \f 67 15 12 \SUCTION BLOWER ASSEMBLY METHOD OF SPINNING YARNS IN SPINNING TURBINES BACKGROUND OF THE INVENTION The present invention relates to a method for separately extracting air from an open-end spinning turbine so as to produce a better controlled flow of air through the apparatus.

In the prior art, air was extracted from open-end spinning turbines by their own ventilating systems in conjunction with corresponding exhaust flow bores. It has also been proposed to employ, for this purpose, blower type structures built onto the turbine.

It is also known to provide open-end spinning turbines in which the air is sucked through the turbine by means of a separate blower.

One prior art system of this type is disclosed in Ger-' man Auslegeschrift (Published Application) No. 1,1 I 1,549.

One drawback of all of these turbines, however, is that they provoke an overlapping of the air stream with the developing yarn or thread and this overlapping is at least partly responsible for causing the developing yarn or thread to have stray fibers bound into its surface, this resulting in the known Bauchbinden (slubs).

SUMMARY OF THE INVENTION It is an object of the present invention to eliminate this drawback. This and other objects are achieved according to the invention by causing the air to be sucked out of the turbine from an annular region in the turbine in the direction toward that side from which the fibers enter into the turbine and toward the axis of rotation of the turbine. The extraction of the air is preferably effected in the vicinity of the fiber collection trough forming part of such turbines.

BRIEF DESCRIPTION OF THE DRAWING The single FIGURE is a longitudinal, cross-sectional view of one preferred embodiment of a turbine operating in accordance with the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The novel method, according to the present invention, for independently extracting air will be described in detail with reference to an open-end spinning turbine having a break-up roller. In the embodiment shown in the FIGURE, such a turbine 2 is mounted in a housing 1. A break-up roller 3 having a conical break-up jacket is also mounted in housing 1 and is disposed to rotate coaxially with turbine 2. Turbine 2 and roller 3 are supported on suitable bearings, as shown, and are driven by suitable, known drive devices, not shown.

Turbine 2 includes a shaft 13 formed to present a longitudinal yarn extraction bore 14. Shaft 13 is mounted in a suitable bearing which rotatably supports the turbine unit. Similarly, roller 3 includes a hollow shaft 9 via which the roller unit is rotatably supported in suitable bearings. Shaft 9 is provided with openings 10 axially aligned with the annular inlet opening of an annular suction chamber 11 surrounding shaft 9. Chamber 11 is connected to a suitable suction blower assembly 15.

Fibers are fed in through a channel 4 in housing 1 in the direction toward the break-up roller 3. Due to the streaming entrained air and the centrifugal force produced by the rotation of roller 3, the fibers travel from the surface of the conical jacket of the break-up roller 3 into the region enclosed by the turbine 2 and then to r the fiber collecting trough 12 formed by the turbine.

They are removed from the trough 12 by traveling radially inwardly while forming yarn 5 and are extracted toward the outside through the yarn extraction bore 14 of the turbine shaft 13. The extraction bore has a widened diameter which serves to effect an increased radial flow of the air in the turbine between the turbinewall and the counterface 7 of the roller 3 and thus better separation between the stray fibers and the yarn. The extraction bore diameter should for example be four times the width of gap between turbine and counterface 7.

According to the present invention, the break-up roller 3 is provided at its interior with a bottom 7 which is connected with the conical jacket by fins 8, for example, so that an annular substantially continuous gap 6 is produced.

Through this annular gap 6 the air is extracted into the region enclosed by the roller from the vicinity of the fiber collecting trough 12 and is removed, for example, through the hollow shaft 9 and its bores 10 and via annular chamber 11 toward the suction blower assembly 15.

This arrangement according to the present invention causes the air entering into the turbine to be sucked into the region enclosed by the break-up roller from the fiber input, and from the gap between the turbine and the break-up roller, as well as from the hollow turbine shaft. Stray fibers are thus completely kept away from the area where the yarn is being formed and extracted out of the turbine.

In any given turbine operating at a selected yarn spinning rate, the suction level, or air flow rate, produced by assembly 15 can be determined according to criteria known in the art to effectively extract the air reaching annular gap 6.

It can be appreciated that the extraction of air according to the present invention can also be effected in a corresponding manner for turbines without a coaxial break-up roller, i.e., with a stationary countersurface. In this case the stream of air is also sucked out toward the same side from which the fibers are introduced into the turbine.

The air flow rate, produced by the assembly 15, depends on the specific design of open-end-spinningdevice. To give an idea, the rate is sufficient, if the vacuum, produced in the spinning turbine, is of the order of mm water-level. (mm Wassersaule), This value can roughly be regarded as independant of yarn spinning rate.

It will be understood that the above description of the present invention is susceptible to various modifications, changes and adaptations, and the same are intended to be comprehended within the meaning and range of equivalents of the appended claims.

I claim:

1. In a method for independently extracting air from an open-end spinning turbine having an inlet region and a yarn extraction region spaced axially therefrom, during the formation of yarn from a stream of fibers fed into the turbine at the inlet region, in which air is drawn into the turbine together with such fibers, is guided into the turbine by a surface of a hollow body at least partially enclosed by the turbine, and is sucked out of the turbine in a direction having an axial component directed toward the inlet region, the improvement wherein the sucking of air out ofthe turbine comprises: sucking air through an annular gap provided in the body and directing the air from theregion of such gap toward the axis of rotation of the turbine.

2. A method as defined in claim 1 wherein the turbine defines a fiber collection trough and the air is extracted from the vicinity of such trough.

3. A method as defined in claim 2 wherein the annular gap is in the vicinity of the fiber collecting trough.

4. A method as defined in claim 1 wherein the turbine is provided with a large diameterfiber extraction bore.

5. A method as defined in claim 1 wherein the open- 1 end spinning turbine is associated with a coaxial break- A.

bine defines a fiber collection trough and the break-up roller is provided with the annular gap in the vicinity of 

1. In a method for independently extracting air from an open-end spinning turbine having an inlet region and a yarn extraction region spaced axially therefrom, during the formation of yarn from a stream of fibers fed into the turbine at the inlet region, in which air is drawn into the turbine together with such fibers, is guided into the turbine by a surface of a hollow body at least partially enclosed by the turbine, and is sucked out of the turbine in a direction having an axial component directed toward the inlet region, the improvement wherein the sucking of air out of the turbine comprises: sucking air through an annular gap provided in the body ; and directing the air from the region of such gap toward the axis of rotation of the turbine.
 2. A method as defined in claim 1 wherein the turbine defines a fiber collection trough and the air is extracted from the vicinity of such trough.
 3. A method as defined in claim 2 wherein the annular gap is in the vicinity of the fiber collecting trough.
 4. A method as defined in claim 1 wherein the turbine is provided with a large diameter fiber extraction bore.
 5. A method as defined in claim 1 wherein the open-end spinning turbine is associated with a coaxial break-up roller constituting the body and said step of extracting is carried out by sucking the air through the break-up roller.
 6. A method as defined in claim 5 wherein the turbine defines a fiber collection trough and the break-up roller is provided with the annular gap in the vicinity of the fiber collecting trough. 